Organic electroluminescent compound and organic electroluminescent device comprising the same

An organic electroluminescent compound represented by the following formula 1-1:

• wherein
• L1 and L2 each independently represents a single bond, a substituted or unsubstituted (C6-C30)arylene or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• Ar1 to Ar4 each independently represent a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, or a substituted or unsubstituted fused ring of a (C3-C30)aliphatic ring(s) and a (C6-C30)aromatic ring(s);
• R1 and R2 each independently represent hydrogen, deuterium, a halogen, a cyano, a substituted or unsubstituted (C1-C30)alkyl, a substituted or unsubstituted (C6-C30)aryl, a substituted or unsubstituted (3- to 30-membered)heteroaryl, a substituted or unsubstituted (C3-C30)cycloalkyl or -L3-N—(Ar5)(Ar6);
• R7 represents hydrogen or deuterium;
• L3 each independently represents a single bond, a substituted or unsubstituted (C6-C30)arylene, or a substituted or unsubstituted (3- to 30-membered)heteroarylene;
• Ar5 and Ar6 each independently represent a substituted or unsubstituted fused ring of a (C3-C30)aliphatic ring(s) and a (C6-C30)aromatic ring(s), a substituted or unsubstituted (C6-C30)aryl, or a substituted or unsubstituted (3- to 30-membered)heteroaryl;
• a is an integer of 1 to 4, b and c are 1 or 2, and when a, b and c are each an integer of 2 or more, each of R1, R2 and R7 may be the same or different from each other;
• and
• when there are a plurality of substituents represented by the same symbol, each of the substituents represented by the same symbol may be the same or different from each other.